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Discussion Starter · #1 ·
I had the check done and all passed but the HC output was close. I'm assuming the HC is for hydro carbons. If so, what in the smog system controls the HC. I know I don't have to worry for a while but I'd like to know what I could replace to bring the HC level down.
 

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HC's are particles of unburned gas, so it's running richer than it should...basically. Alot of things are responsible, but with most cars, I'd immediately look at O2 sensors, and also cats. It could be something as simple as a clean air filter or cleaning your MAF though.
 

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Discussion Starter · #3 ·
That would make sense since i know the Cats are about shot and I've yet to replace the O2 sensors
 
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